Micromechanical simulations and analyses based on synchrotron 3D imaging for nodular cast iron tested under different stress states

Thilo F. Morgeneyer (1) , Ante F Buljac (1, 2) , Modesar Shakoor (3) , Jan Neggers (2) , Marc Bernacki (3) , Pierre-Olivier Bouchard (3) , Lukas Helfen (4, 5) , François Hild (2)

1 CDM - Centre des Matériaux
2 LMT - Laboratoire de Mécanique et Technologie
3 CEMEF - Centre de Mise en Forme des Matériaux
4 ESRF - European Synchrotron Radiation Facility
5 ANKA - Institute for Photon Science and Synchrotron Radiation

A combined computational–experimental framework is introduced herein to validate numerical simulations at the microscopic scale. It is exemplified for a flat specimen with two machined holes hole made of cast iron and imaged via in-situ synchrotron laminography at micrometer resolution during a tensile test. The region of interest in the reconstructed volume, which is between the two machined holes, is analyzed by digital volume correlation (DVC) to measure kinematic fields. Finite element (FE) simulations, which account for the studied material microstructure, are driven by Dirichlet boundary conditions extracted from DVC measurements. Gray level residuals for DVC measurements and FE simulations are assessed for validation purposes. The influence of the used boundary conditions, from FE simulations or from DVC measurements, on the predicted void growth is assessed for a case with two small machined holes in the flat sample that localize strains in the ligament between them.

Mots clés: Numerical simulation; Finite element; Cast iron

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Thilo F. Morgeneyer, Ante F Buljac, Modesar Shakoor, Jan Neggers, Marc Bernacki, et al.. Micromechanical simulations and analyses based on synchrotron 3D imaging for nodular cast iron tested under different stress states. Journées annuelles SF2M, SF2M (Société Française de Métallurgie et des Matériaux), Oct 2017, Lyon, France. ⟨hal-01625141⟩